Effects of Frequency-Controlled Ear Acupuncture on COVID-19- related Refractory Olfactory Dysfunction: a Randomized Clinical Trial.

Background: Olfactory dysfunction is a common COVID-19 symptom, posing treatment challenges.

Objectives: We aimed to investigate the efficacy of frequency-controlled ear acupuncture in treating COVID-19-related olfactory dysfunction.

Methods: A randomized, participant-blind clinical trial occurred at the Rasoul Akram Hospital (IRCT20210311050671N1).